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ICD-10 Guide
ICD-10 CodesM61.579

M61.579

Billable

Other ossification of muscle, unspecified ankle and foot

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/17/2025

Code Description

ICD-10 M61.579 is a billable code used to indicate a diagnosis of other ossification of muscle, unspecified ankle and foot.

Key Diagnostic Point:

M61.579 refers to a condition characterized by abnormal ossification or calcification of muscle tissue in the ankle and foot regions. This condition can arise from various underlying causes, including trauma, chronic inflammation, or certain metabolic disorders. The ossification process can lead to stiffness, pain, and reduced mobility in the affected areas, impacting the patient's quality of life. Clinically, patients may present with localized muscle weakness, swelling, and discomfort during movement. Diagnostic imaging, such as X-rays or MRI, may be utilized to confirm the presence of abnormal calcifications. Treatment options often include physical therapy, pain management, and in some cases, surgical intervention to remove the ossified tissue. Understanding the etiology and clinical implications of this condition is crucial for effective management and coding.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and underlying causes
  • Need for precise documentation of symptoms and imaging findings
  • Differentiation from other muscle disorders and ossification conditions
  • Potential for co-existing neuromuscular conditions

Audit Risk Factors

  • Inadequate documentation of clinical findings
  • Failure to specify the site of ossification
  • Misclassification of the condition as a different muscle disorder
  • Lack of supporting imaging reports

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed clinical notes on the patient's history, physical examination findings, and imaging results.

Common Clinical Scenarios

Patients presenting with chronic pain and stiffness in the ankle and foot, often following trauma.

Billing Considerations

Ensure that all relevant imaging studies are documented to support the diagnosis.

Rheumatology

Documentation Requirements

Comprehensive assessment of inflammatory markers and patient history of autoimmune conditions.

Common Clinical Scenarios

Patients with myositis or other inflammatory muscle disorders presenting with ossification.

Billing Considerations

Document any systemic symptoms that may indicate an underlying rheumatologic condition.

Coding Guidelines

Inclusion Criteria

Use M61.579 When
  • According to ICD
  • 10 guidelines, M61
  • 579 should be used when there is evidence of ossification of muscle in the ankle and foot without a more specific diagnosis
  • Coders must ensure that the documentation supports the diagnosis and that no other more specific codes apply

Exclusion Criteria

Do NOT use M61.579 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

20610CPT Code

Arthrocentesis, aspiration and/or injection into a major joint or bursa

Clinical Scenario

Used when joint aspiration is performed due to associated swelling.

Documentation Requirements

Document the reason for aspiration and findings.

Specialty Considerations

Orthopedic specialists should ensure that the procedure is justified based on clinical findings.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of conditions like M61.579, improving the accuracy of diagnoses and treatment plans. This specificity aids in better tracking of patient outcomes and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of conditions like M61.579, improving the accuracy of diagnoses and treatment plans. This specificity aids in better tracking of patient outcomes and resource allocation.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of conditions like M61.579, improving the accuracy of diagnoses and treatment plans. This specificity aids in better tracking of patient outcomes and resource allocation.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

What are the common causes of ossification of muscle?

Common causes include trauma, chronic inflammation, and certain metabolic disorders. Conditions like myositis can also lead to ossification.